Not appropriate for runoff with high sediment loads without aggressive pretreatment.Can be more costly and difficult to install and maintain than surface practices like bioinfiltration SMPs.Key Advantages of Subsurface Infiltration Provided that overburden loads and utility conflicts are evaluated, they can be sited beneath lawns and recreational areas, as well as parking lots and other hardscape surfaces. Subsurface infiltration SMPs are versatile SMPs suitable for many types of development, from single-family residential to high-density commercial projects. For large sites, multiple subsurface infiltration SMPs can be integrated throughout to manage larger areas. They can be used to manage stormwater on both small and large sites. Subsurface infiltration SMPs must have underlying soils that, when tested pursuant to the infiltration testing procedure described in Section 3.3, are determined to be infiltration-feasible. Subsurface infiltration SMPs should be considered only if surface bioinfiltration/bioretention SMPs are not feasible on-site. An example of a subsurface infiltration basin in Philadelphia When Can Subsurface Infiltration Be Used?
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